Automatic sales apparatus



E. H. HEM:

AuToAAATTc SALES APPARATUS.

APPLICATION FILEU DEC. 24 i925. blggo Paau'eem E2, MEZA ma. Hm. AUTOIIIATIL` SALES APPARATUS.

APPLICATION FILED DEC. I4; 1920,

Pamme Seme T29 L 'E. H. HEI- T.

AUTOMATIC SALES APPARATUS. APPLICATION FMD 0.50.14. 1920.

E. H. HELT.

AUTOMATIC SALES APPARATUS. APPLfcATIoN FILED 0150.14.1920.

Pmdsepn 22, 1922 Wi T N E, 2

fm f ff IL IIa Him AUTOMATIC SALES APPARATUS. A

APPLICATION FILED DEC. I4, I920..

` venient coin-controlled type.

Septo l2, lQZ;

'Wren stares EDWARD H, HELT, OF BELLEVUE BOROUGH, PENNSYLVNIA.

anroivrnrrc sanas arrana'rirs;

Application filed December T0 all 'LU/"ioniz't mayconcem: l

Be it knownthat l, EDWARD. H. HELT, a

citizen of the` United States, and residing inthe borough of Bellevue, in the county of Allegheny andState of Pennsylvania, have is intended is for restaurant use in connec-V take oli" where the customer has access to the food. Means are provided convenient to the customer whereby the shelves may be set in motion, such means being `of any con- 'Means' are provided whereby when the; article which the customer has paid for, byv dropping theproper' lcoinor coins into the coincontrolled mechanism,has been delivered to him, the traveling shelves become stationary and so remain until ,a fresh coin or coins are inserted into the mechanism `and the same is actuated;

rOther novel features offconstruction and arrangement of parts will appear from the following description.y

ln the accompanying drawings, which are however merely intended to illustrate a practical Aembodiment of the principles of my invention without limiting the scopeof lthe i latter' to the construction shown, F'ig. 'l is perspective showinga store or restaurantl unit embodying .the principles of my 1nvention.; Fig. 2 is a broken plan view show@ inga plurality of such units assembled together 'as the same are arranged in an automatic restaurant'; Fig. 3 is a broken side elevation showing the front end of one of the side plates of a unit; Fig. 4 is a section taken'along the line IVlV in Fig. 3 but also showing the side beam ofthe unit; Fig. 5 is a similar view taken along the 14, 1920. Serial No. 430,673.

line Vv- V in Fig. 3; Fig. 6 is a broken perspective showing the front end of said vside plate; Fig. 7 is a broken side elevation of the rear portion of the same; Fig. 8 is a perspective of one of the shelves; Fig. 9 is a broken side view of the rear portion of is a similar view` vwith some of the parts removed and others in section; Fig. ll is an enlarged detail in side elevation showing the .locking disk in operative position to hold the shelves stationary; Fig.l l2 is a similar but b ioken view showing the lock ing bar depressed by the releasing disk out of contact with the `locking disk and thus applying rotative power to the driving sprockets; Fig. 13 isav rrear view of the releasing dhisk, Fig. 14 is a plan view of the same; Fig. l5 is abroken vertical cross section of the sales unit showing the side lframes', the shelves, the driving chains,

the driving sprockets engaging said chains from below, and the meansforapplyingpower .to said driving sprockets, said means being shown in their inoperative position.

The following is a detailed description of the drawings, the construction of an individual unit being irstdescribed. f

`Each unit is provided with a horizontally disposed frame, supported at a` convenient lheight, as by the verticallegs l. A represents the longitudinal side beams of the frame, which are conected.. together in spaced relation in any convenient manner. B represents the inner side plates which are spaced inwardly from the beams A, and are preferably of composite construction, as will be described. Y

rllhe plates B are each provided with ,an upper and a lowerv longitudinal trackway, preferably in the form of horizontal slots Q and 3, respectively;l

connected by outwardly "convex, semi-circular slots 4 and 5, respectively, the radius of slots 4 and ,5 being equal to one half the vertical distance between the jslotsQand 3, ln the rear of slot 4, a pair of slots 6 and 7 of equal radius, similarly connect the slots 2 and 3, the slotG intersecting the axis of slot 4, and the slot '7 intersecting the axis- -of slot 6. Similarly disposed slots 8 and 9 are provided in front of the rear end slot 5.

The frontend rear ends of said slots are l the unit with the casing removed; Fig. l()

Thus eachv of the plates B is separated into or composed of a plurality -of sections so that'screw bolts may be inserted through the'beam A and screwed into threaded holes in the ends of the studs 16.

To provide clearance between the segmental sections 13 and 15, respectively, and

lthe beam A, I prefer to supportsaid sections in place by meansof exterior-bridge pieces 18 attached to the central section 11 and to the sections 13 and 15respectively, said bridges being cha'nnelled or curved to giveclearance to an element protrudingrr`r slightly through the slots 7 and 9.

and the side vplate B with their axes' alined with the .axes of the curved slots Gand 8 respectively, and their radius being equal to that of said slots. Any convenient method of journaling said sprockets may be `connected together by the pins 19a.

used. Thus they may be mounted on axles whose ends are` mounted inI holes in the bridges18 and the bea-m E represents a pair of endless chains, one of which is mounted upon the vfront and rear sprockets -C and D. between each beam A and the adjacent plate..B. Said chains are composed of links, such as 19 `pivotally Thus it is evident, that the upper and lower flights of the chains will travel parallel with theslots 2 andl 3, respectively, while the ends of the chainslwill .parallel the end slots 6 and 8, respectively. The chains E are intended to beinterm1ttentlydriven, as-

will 'be explained.

F represents the traveling shelves or flelivery pansY which are mounted close together in continuous vseries on the chains E' and which travel between the plates In the drawings'l show the shelves F as provided with a flat top and downwardly flanged edges. Said shelves may be of metal and enameled to suit the color scheme of the restaurant. Three supporting' rods 20, 21 and 22 are provided for each shelf, said rods extending through holes in the side flanges of the shelf and under the tops ot2 the shelves, and provided on their ends' 'with rollers 23.

The ends 'of the rods 20 and 22 extend sufficiently for the rollers 23 to engage and ride in the slots in the plates B, the rods extending through the slots but being short enough toclear the chains E, while the center rod 21 is longer so as to engage the chain E, the ends of said rod being used, as a substitute-for the chain pins 19H to from entering 't connect the links 19 tegether, the' extremities o r being pierced for the cotter pins 2li Y held the links on the rod.

Thus as` the t travel with the To prevent f.

v .ds oi the rods 2O and 21 upper end of the Vslot 7 as a pan agproaches` the front of the frame, l pre vide a cross-over or switch'in the form of a bar pivoted'to the section 13 and normally maintained in the horizontal posi! tion shown in Fig. 6 by mea-ns of the spring 26 which holds the free end of said bar seated in a bracket 27. The tail 28 of said bar is outwardly and then upwardly curved, so as to be cleared by the end of the front rod 20 of a shelf but to be engaged and forced down by the intermediate rod 21 or said shelf, thus throwing up 'the bar 25 y v i after-the rods 20 and. 21 of a pan have C 'and D represent thefront and rearfv sprockets journaled between'the beam A` 'crossed over the upper end of -slot 7 and permitting the rear rod 22 ofthe pan, toA enter said slot as the pan begins to descend. y The upper end of theslot 6 is like-wise pro' E move, the shelves.

atl

they, in turn, reach the front of the frame will descend, maintaining their horizontal position, and pass rearwardlgL alongthe bottom flights of the chains. t the rear, the

pans in turn rise up to the top -ilight of thechains, maintaining their tions unaltered.

In rising at the rear the front rods' 2O traverse the slots 9; the intermediate rods 2l traverse the slots 8, while the rear rods 22 traverse the slots 5. To prevent the jarhorizontal lposiring of the shelves as rods 22 move over the up er end of the slots 9 and 8, and as the ro s 21-move over the upper end of lthe slots 9, Ir provide pivoted and'spring seated cross-overs 32a for the upper ends of slots 8 and 9 which enable all of the rods, except iis those traversing 'said slots, to ride over tlie 'i mouths of the latter without jarring, but l.

which permit the rods traversing said slots to push the cross-overs aside and pass freely.

into the upper slotf2.

The shelves F are provided with upwardly extensible backs 33 normally re-` pressed as shown in F ig. 8, but raised .as the pans reach the front of the frame, as shown in Fig. 1.

Y Thus I have shown the back 33 formed of a piece of sheet metal, which may be enameled,- and its ends being bent around the -of the frame 34v between the bottom top and bottom barsA of a heavy wire frame 34. The back is mounted to slide vertically in a traverseslot 35 in the rear ofthe pan, and is normally held -depressed by the helical springs 36 wound. about the vertical bars bar of said frame and the pan. i

37 represents track members secured to the inner faces 'of the plates^B near the front of the frame, said tracks, asshown in Fig. 3 having upwardly inclined approaches or rear ends, and horizontal front portions, so that as the shelf moves forwardly, the lower edge of its back 33 willyride up' along the tracks 37, raising the back, as shown in l? ig. l, and'holding the same elevated until said back passes of said tracks as the shelf starts to descend, thus permitting the back to automatically resumeits depressed position relative to the shelf.

l provide means, preferably coin-actuatedv for driving the chains E to position the shelves F in turn at the front of the machine.

- rlfhus G represents a pairof. driving' sprockets engaging the chains Efrom below and rigidly 4mounted on the shaft 38 who/se ends are horizontally journaled in supporting plates 39 attached to the machine frame.

H is a power shaft horizontally liournaled in the lower portion of the machine frame transversely of the machine and driven at constant speed, by the electric motor l, 40

is a bevelled gear on shaft H meshing with a similar. gear 4l iixedon the lower end of a sleeve 42 journaled in a bracket 43 on the machine frame.

, 44 is a vertically disposed shaft joiii'naled in suitable bearings on the machine frame, having its lower end idly stepped-in the sleeve 42 while its upper end is provided with a bevelled gear 45 meshing with a larger bevelled gear 46 on the sprocket shaft 38. 47 is a sleeve slidably mounted on the shaft 44 and caused to rotate in unison therewith by means of' a radial pin 48 on'said 1 shaft engaging a longitudinal rslot` 49 in said sleeve. rlfhe upper end of sleeve 42 isi-provided with a clutch member, such as angular teeth 50 adapt/ed to engage 'a comple'- mentaiyclutch member, such as the teeth 51 on the lower end of the sleeve 47. Thus when said sleeve 47 is raised, as shown in' Figs. 9,

Y ll and 15, the shaft 44 and consequently the chains E are idle, but when .said

sleeve 47 is so as to engage the clutch 50-51, the

sprockets G are driven, causing' the chains E and the shelves F to travel.

52-is a collar freely rotating on the sleeve 47 and held against longtitudinal movement relative thereto by means of upper andy lower nuts 53 screwed onthreaded portions of said sleeve 47. Said collar is provided with opposed pierced ears 54, to whose ends lowered relative to said shaft 44,

are pivotally connected the lower ends of links 55 .which are pivoted at their upper ends to an integral ear 56depending from the locking bar l57 rigidly carried by the free ends of,v a pai'rcof links 58 mounted on' a 70 horizontal pivot post 59 extending from the plate 39,- 60 being a spacing sleeve-on said post between said links. A

Said bar 57 is normally held seated in one of the locking notches 61 on the perimeter of the locking disk d, rigidly mounted on shaft 38, by means ofv a helical spring 62 connectingpne of said links 58 with a 'post 62a extending yfromthe plate 39 and exerting a lifting tension on the locking bar.

1When theflocking .bar is engaged with the locking disk, the clutch 50-51 is disengaged -and the shaft 44 isidle. The disk J is provided with one or more locking seats. Thus in the drawings l yhave shown four of suoli seats, the same being spaced far enough apart so that the disk will travel between locking-positions with the shaft 3 8 sulfi- `ciently to move the chains E a distance four lnotches 6l' in the drawings, the hub 63 of the disk K- is provided with a circumferential slot 64 engaged by a radial pin 65 on said fshaft, the slot being of proper length -to a'llow the. disk K a quarter turn on said shaft. The disk K is `coupled to the disk il by means` of -a helical spring 66 wound loosely about the hub 63 of disk K and having its ends attached to studs 67 and 68 on 110 the adjacentfaces of disks K and J, respectively. fThe influence of said spring is exi erte'd when wound up, to rotate said disk K in the same direction as that in which the shaft 38 is rotated when power driven, that 115 is, in the mechanism shown, clockwise. The perimeter ofthe disk K is composed of a plurality of curved surfaces 69, equal in number to the locking seats 6l on the disk d, and eccentric to the axis of the disk K; 12o said surfaces Haring counterclockwise, or in a direction opposite to that of the disks rotation. 70 represents radial shoulders interposed between adjacent cam surfaces 69.A The maximum diameter of the disk K is 1.25 equal to that of the disk d.

The' disks are assembled on the shaft 38 in such relation that when the shaft 38 is. locked stationary by the engagement of the locking bar 57 with one of the notches 6l 130 of the disk J, as shown in Figs. '9, 11 and 15,

ving disk K is held in this position by means of one of the vblocks 7l attached to its rear face, and in number equal to that of the notches 6l in the disk J. The block corresponding to the notch engaged at the time by the locking .bar 57, is engaged by a dog 72 pivoted at its angle on a post 72 extend- 'ing from the plate 39 and having. its angular tail connected from below by the spring 73 to the end of a po'st 73aextending from the plate 39. Thus the-spring 73 tends to swing the dog 72 into engagement-with the block 7l. 74 is a finger pivotally connected .at its' outer end to the lower end of a rocking lever which is pivoted intermediate of its ends to the plate 39. The linger 74 is also connected to the lever 75A by the helical spring 76 which normally causes said finger` to press up against the under side'of a'bracket 77 on the dog 72 which extends forwardly past the disk K. The linger 74 is provided with' an angular shoulder 74g, which is in engagement with the bracket 77. Thus when the lever 75 is rocked, moving vits upper end in the direction of the arrow in F ig. 10, the reverse movement of the linger 74 will pull the dog 72 outwardly from envagement with the block 71, thus releasing the disk, so that its spring 66 will cause the disk to be turned clockwise until the radial pin 65 of the shaft 38 engages the rear end of the slot 64 in the hubof said disk. The result is that the cam surface 69, in moving engagement with the locking bar 57, will force the latter downwardly, unlocking the disk J, and consequently the shaft 38, and throwing in the clutch 50-51,fas shown in Fig. 12 thereby applying power to the sprockets G and causing the shelves F to travel. The free en d of the in'ger74 is extended between the -disks J and K, and curved as shown in Fig. 10. 78 representsa plurality of pins on the front face of the disk K, one corresponding to each block 71.`

lVhen the linger 72 is released from the block 71, as above described, and the disk K begins to rotate on the shaft 38 under vthe influence of the spring 66, the' adjacent pin 78 engages and rides along the 'fingerf7'4, thus depressing the same by stretching the spring 76, and thus permitting the spring 73 to draw the dog-72 back into the position shown in Fig. 10 ready to be engaged by the next locking block 71 when the ,latter is brought into position by-the turning of the disk K, thus again locking the disk K stationary. The pin 78 then rides olf the end of the finger 74,'permitting the spring yerably provided with a dust 76 to draw said linger back into the position shown Ain Fig. 10 with its shoulder 74 engaging the bracket 7 7. The disk K has now again assumed the relative position shown in Fig. l0, thus relieving its downward pushing action on the locking lever 57 and thereby permitting said lever to spring up into engagement -with 'the next locking notch 61of the disk Jas the same turns into position.l Thus the clutch 50-51 is thrown out, rendering the sprocket shaft 38 idle,

'and the said'shaft is vagain locked station ary, the shaft 38 having rotated just suiiiciently, a,quarter turn in the drawings, to advance the shelves F a distance equal to the distance 'from center to centerof adjacent shelves. l

The movement vof the disk K, relative to the shaft 38, is substantially instantaneous, owing toth'eexpansion of the` spring 66, and the movement of the shaft 38 and with it the disk J, after the disk K has been again halted, asv above described, b" the contact of the locking dog 72with t e next block 71,' vcauses the spring 66 to be again wound up for the next release.

y It is thus evident that when the upperv end of the .-lever 75 is drawn forwardly, rotary .power is applied to the sprockets G long enough 'to present afresh'shelf F to the front end of the machine, but when the .predetermined movement has been accomplished the power is automaticallydisencontrolled mechanism is connected, as by the bell crank lever'member 79 and link 8O with the upperend of the rocking lever-75.

coins are introduced into the mechanism L and the plunger 81 is depressedtipping the crank 79 forwardly, the .upper end of the lever 75 will be moved forwardly, causing the lower end of the lever 75 to be moved rearwardly, thus actuating the driving mechanism as above described. However, even if the Iilunger 81 of the coin operated mechanism is still held depressed, -the clutch 50-51 will be automatically thrown It is evident that when the proper coin or out and the disk J `locked stationary when` the limited movement described is .completed, owing to the depression of finger 74 by the pin 78, thus 'causing the dog 72 to swing into engagement with the Anext block-.71. v-

`The disk and clutch mechanismispreff prooifcasing" M as shown 1n Fig. '1. 'l'

iaeasee i ln the use of-my units access can be fhad by the cust-omer only to the front shelf F,

and the raised back 33 of said shelf prevents his reaching back to the second shelf. The4 tween the sides of adjacent units with sheets at-the front where an inclined glass shield` or plates of enameled metal 82 and covering the entire series of units in front of the kitchen wall N with a horizontal glass wall 83suitably supported by posts Stand open 85 may be provided. An ornamental glass or enameled metal shelf 86 supported by legs 87 may be provided in frontof the units, and the front ofthe frame under 'said shelf may be closed by a glass or marble plate or wall 88. 5

To. enable me to either. keep 'articles of 'food hot orfrefrigerated I may introduce longitudinal pipesr 89 between the upper and loweriights of the shelves F. Such pipes can be convenientlysupported by struts or supports extending between the' side plates B and may have supply and escapeconnections 90 at the rear, as shown in Fig. l. i

Wlier e a plurality or battery of units are installed side by side in fitting up a restau,-

rant but one motor is required,the driven shaft extending transversely of all the units 4and being thecommon source ofpower for the same. p i

' From the foregoing description, illustrative of the principles of my invention, it is evident that the same `is particularly and advantageously applicable to automatic or' self-service restaurants and like purposes where the patron or customer is expected to.

serve himself to the food or other article to be purchased, by inserting the proper coin or coins into the coin-actuated control mech- "anism. My invention is much more economical than the types of mechanism for such purposes now in use. lt requires much Jfewer kitchen help as the shelves of a large number of units can be kept loaded by a single person with but little effort, and none of the units are rendered inoperative during reloading. Also hot dishes. may be kept at proper temperature on the moving shelves. .Thus such articles of food as soups and cotfee may be dispensed. Also refrigerated foods such as ice cream and melons may also be dispensed in a satisfactory manner.

lf desired cross-overs or switches similar to those provided for the vupper ends of the arcuate stop 6 and 7, may be provided tor the lower ends of the slots 8 and 9 to properly direct the rods 2O and 22 as the shelf starts to ascend at the rear end of the plates B. i A I' Although, for the sake of clearness, l have minut-ely described the embodiment of the principles of my invention, shown in the 4 drawings, l dont wish to limit myself thereby, but claim"l broadly :-J

1. ln automatic service apparatus, the combination of a plurality of series of dispensing shelves, eachseries being comprised of shelves arranged to move unison and to be presented lin turn in the dispensing position, and the several series being arranged in parallelism,'a common source of power for causing said series of shelves to travel, clutch mechanisms interposed between the series oit shelves and said source of power, a' separate clutch mechanism being provided for each series otshelves so that any single selected series of shelves may be caused to travel independently of the re maining series, and an individual coin-controlled device for each ofsaid clutch mechanisms whereby upon the insertion of the proper -coin or coins into one of said coincontrolled devices the associated clutch mechanism may be thrown into its operative position and the associated series ofvslielves caused to travel independently of lthe remaining series.

2. ln automatic service apparatus, the combination ot a plurality of Iseries ofdispensing shelves, each series being comprised "of shelves arranged to move in unison and to be 4 presented in turn 1n the. dispensing posiv tion, and the several series being arranged in parallelism, a common source of power 4:for causing-said series of vshelves to travel, clutch mechanisms interposed between the series of shelves and'such source of power, a separate clutch mechanism being provided :tor each series of shelves so that any single selected series or' shelves may be caused to travel independently of the remaining series, an individual coin-controlled device for each one of said-clutch mechanisms whereby upon the insertion of the proper coin or'coins into any one ofsaid coin-controlled devices the vassociated clutch mechanism may be thrown into its operative position and the associated series of shelves caused to travel independently of the remaining series, and means whereby when a fresh shelf in the traveling series is presented in the dispensing position the travel of said series ot shelves is automatically halted. L

3. in automatic service apparatus, the

combination of a plurality of series of disies' the series of shelves and said power shaft, a

separate clutch mechanism beingprovided for each series of shelves so that any single selected series of shelves may b e caused. to travel independently of the remaining series, and an individual coin-controlled device for each of said clutch mechanisms whereby upon the insertion .of the proper coin or coins'into any one of said coin-controlled de' vices the associated clutch mechanism mayv be thrown into its operative position and the associatedseries of shelves caused to travel independently of the remaining series.

4. In. automatic service. apparatus, 'the combination of aplurality of series' of disj .pensing shelves, each series being comprised of shelves arranged to move' in -unison and to be presented in turn in the dispensing position, and the several series being arranged in parallelism, a continuously drivenpower shaft, clutch mechanism' interposed between the series of shelves and said power shaft,-a

separate clutch mechanism being provided for each series of shelvesso thatl anyv single selected series of shelves may be caused to' l' travel independentlyof the remaining series,

an individual coin-controlled devicefor each of said clutch mechanisms whereby upon the insertion of the propercoin or coins into any one of the coin-controlled devices the associated clutch mechanism may be thrown into its 'operative' position and the associated series of shelves caused to travel independently of the remaining series, and means whereby when a fresh shelf in the .traveling y series is presented in the dispensing position the travel of said series of shelves is auto-` matically halted.

5. ln service apparatus, thecombination of a pair of spaced apart side members slotted to form tracks composed of upper t and lower horizontal reaches connected tosides of said side members and which are engaged by said center rods to cause the shelves to travel. 1

6. In service apparatus, the combination `of a pair of spaced apart side members slotted to form tracks composedof upper and lower horizontal reaches connected together at each end by three spaced a Dart arcuate slots, a plurality of horizonta ly disposed shelves mounted between said side members, each shelf being provided with travel.

three rods projecting laterally into said slotted vtracks at eachside, one opposed pair of rods being positioned at the center of the shelf and the remaining rods being opposed in pairs atthe' front and rear of said shelf, the two center rods only projecting through said slots, driving chains on'tlie outer sides 'zontal position throughout their travel.

7. In service apparatus, the combination 0f a' pair of spaced apart side members slotted to form tracks composed of upper and lower horizontal reaches connected together at each end by three spaced apart arcuate slots, a plurality ofv horizontally disposed shelves mounted between said side members, each shelf being provided with three rods projecting laterally into said slott-ed tracks at eachside, one opposed pair of rods being positioned at the-center of the shelf and the'remaining rods being opposed in pairs at the front and rear of said shelf, the two center rods only projecting through said slots, driving chains'on the outer sides of said side members and which are engaged by the center rods of said shelves to cause the shelves to travel, and automatic switching devices at the ends of said tracks to distribute said rods to the proper arcuate slots whereby said shelves are causedto maintain their horizontal' position throughout their 8. In service apparatus, traveling dispensing mechanism, a shaft adapted to ac tuate the same, a disk rigidly mounted on -said shaft, a locking member adapted to engage said disk to hold said shaft stationary a releasing disk movably mounted on sai shaft, a driven shaft, clutch mechanism interposed between said shafts, and means whereby the movement of said second disk independently of said shaft releases said lockfnfT means and renders said clutch mechanism operative.

9. In service apparatus,traveling dispensing mechanism, a shaft adapted to actuate the same,adisk rigidly mountedon said shaft, a locking member adapted to engage said disk to hold the dispensing mechanism stationary, a spring actuated releasing disk 4movably mounted on said shaft and a'dapted to re-` lease said locking member, a second locking member for holding said releasing disk stationary, a driven shaft, operative connection between said shafts including a clutch, means whereby when said first named lockingmember is released said clutch is engaged, and means for releasing said second` named locking means.

l said releasing disk stationary, 1

masses l 10.l ln Service apparatus, traveling dis?v pensing mechanism, a vshai't adapted to actuate the same, a disk rigidly mounted onl said shaft, a locking member adapted to engage said diskv to hold the p dispensing mechanismv stationary, a spring actuated re- Aleasing disk movably mounted ony said shaft and adapted to release said locking inem"- b'er, a second locking member for holding a driven shaft, operative connection between said shaftsV including a clutch, uneans whereby y when said first namedloeking member 1s released said clutch is engaged, means Whereby when said locking disk is moved a predetermined degree said first named locking member re-engages said locking disk and said. clutch is disengaged, and mechanism for releasing said second named locking member.

11. ln service apparatus, the combination of a series ofrshelves adapted to travel in p unison land to be presented in turn at the dis.-

pensing position' at the front of said apparadispensing position at the ront of said apparatus, said shelves being inclosedpbysaid apparatus except when in the dispensing position, backs for said shelves, said backs being normally depressed, and means Wherel by as a shelf assumes the dispensing position its back is elevated to prevent access to the shelves .in the rear.

Signed at Pittsburgh, Pa., this Brdqday of `December, 1920. 4 v

EDWARD ii. naar, 

